The arithmetic mean of the following data is .

23, 17,20,19,21

The average of five natural numbers is p. If the next three numbers are included then how much the average of these 8 numbers exceeds than the average p?

The least number, which must be added to 6709 to make it exactly divisible by 9, is 

Three numbers are such that if the average of any two of them is added to the third number, the sums obtained are 168, 174 and 180 respectively. What is the average of the original three numbers?

If a 7-digit number 54p3987 is divisible by 11 , then p is equal to:

Direction : What value should come in the place of question mark (?) in the following questions?

11283 + 25 % of ? + 727 = 13280 

The average of five consecutive number is 26, then the multiple of the first and the last number is

What is the sum of all three-digit numbers which are divisible by 20?